Wheat blast caused by the hemibiotroph fungal pathogen Magnaporthe oryzae Triticum (MoT) pathotype is a destructive disease of wheat in South America, Bangladesh and Zambia. This study aimed to determine and compare the activities of antioxidant enzymes in susceptible (wheat, maize, barley and swamp rice grass) and resistant (rice) plants when interacting with MoT. The activities of reactive oxygen species-detoxifying enzymes; catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX), glutathione S-transferase (GST), peroxidase (POX) were increased in all plants in response to MoT inoculation with a few exceptions. Interestingly, an early and very high activity of CAT was observed within 24 h after inoculation in wheat, barley, maize and swamp rice grass with lower H₂O₂ concentration. In contrast, an early and high accumulation of H₂O₂ was observed in rice at 48 hai with little CAT activity only at a later stage of MoT inoculation. The activities of APX, GST and POD were also high at an early stage of infection in rice. However, these enzymes activities were very high at a later stage in wheat, barley, maize and swamp rice grass. The activity of GPX gradually decreased with the increase of time in rice. Taken together, our results suggest that late and early inductions of most of the antioxidant enzyme activities occurs in susceptible and resistant plants, respectively. This study demonstrates some insights into physiological responses of host and non-host plants when interacting with the devastating wheat blast fungus MoT, which could be useful for developing blast resistant wheat.

由半营养型真菌病原体Magnaporthe oryzae Triticum (MoT) 致病型引起的小麦瘟病是南美洲、孟加拉国和赞比亚小麦的一种破坏性病害。本研究旨在确定和比较抗氧化酶在与 MoT 相互作用时在易感（小麦、玉米、大麦和沼泽稻草）和抗性（水稻）植物中的活性。活性氧解毒酶的活性；过氧化氢酶 (CAT)、抗坏血酸过氧化物酶 (APX)、谷胱甘肽过氧化物酶 (GPX)、谷胱甘肽S-转移酶 (GST)、过氧化物酶 (POX) 在所有植物中都响应于 MoT 接种而增加，少数例外。有趣的是，在 H 含量较低的小麦、大麦、玉米和沼泽稻草中接种后 24 小时内观察到了早期且非常高的 CAT 活性。₂ O ₂浓度。相反，H ₂ O _{2的早期和高积累}仅在 MoT 接种后期在 48 hai 的水稻中观察到 CAT 活性很小。水稻侵染初期APX、GST和POD的活性也较高。然而，这些酶在小麦、大麦、玉米和沼泽稻草中的活性在后期非常高。GPX在水稻中的活性随着时间的增加而逐渐降低。总之，我们的结果表明，大多数抗氧化酶活性的晚期和早期诱导分别发生在易感植物和抗性植物中。这项研究展示了宿主和非宿主植物在与破坏性小麦瘟疫真菌 MoT 相互作用时的生理反应的一些见解，这可能有助于开发抗稻瘟病小麦。